Subscript op on TypeAlias to Enum is misinterpreted

Bug Report

Scanning code that makes use of an alias for an Enum class flags an error.

I see several similar issues in the GitHub issue list, e.g.
https://github.com/python/mypy/issues/14281
https://github.com/python/mypy/issues/13337

The error messages in those tickets is different however.

To Reproduce
Gist

Expected Behavior

No error

Actual Behavior

main.py:14: error: Type application targets a non-generic function or class
main.py:14: error: Variable "name" is not valid as a type
main.py:14: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
Found 2 errors in 1 file (checked 1 source file)
Your Environment

• Mypy version used: 0.971
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.6.9 (I know, I know)

Start with the linked Gist and reproduce the reported diagnostics using mypy 0.971, then trace how the checker resolves the Enum type alias and subscript expression. Done means the reproduction produces no error while preserving correct handling of non-generic types.